Type-writing machine.



J. J. COOPER.

TYPE WRITING MACHINE.

APPLICATION FILED APR.25,1911.

1, 1 1 3, 103. Patented Oct. 6, 1914.

4 SHEETS-SHEET "WlTNESSES: mvuwom J. J. COOPER. TYPEWRITING MACHINE. APPLIOA TION FILED APR. 25,1911.

1,113,103. Patented0ct.6,1914[ 4 SHEETSSHBET 2.

WlTN Esszs: lNVEWM:

ATTORNEY J. J. COOPER.

TYPE WRITING MACHINE.

APPLIOATION FILED APR.25,1911,

Patented Oct. 6, 1914.

4 BHEETS-SHEET 8.

INVENTOR: BY W W mung? wlmgsszs.

J. J. COOPER.

TYPE WRITING MACHINE.

APPLICATION FILED APIL 25, 1911.

1,1 13,103. Patented 0013.6,1914.

4 SHEETSSHBET 4. Fl G18. FIGQ.

WITNESSESi \NVENTOR:

U I TE STATBE ljidtf jk ill tll UFFIQ-EQ JOHN JOSEPH COOPER, OF LONDON, ENGLE-fll'i'),

WRI'IER COMPANY, OF NEV YORK, N. '21, A CORPORATION OF DELAWARE.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Application filed April 25, 1911.

Patented Oct. 6, 1914.

Serial No. 623,166.

To all whom it may concern.-

Be it known that '1, Joint Josnrn Coornn, a subject of the King of Great Britain, and resident of 120 Queen Victoria street, London, E. Q, England, type-writer mechanic, have invented certain new and useful lm provements in Type-Writing Machines, of which the following is a specification.

This invention relates to means for controlling the revolution of the platen of a typewriting machine adapted to fill-in, successively, forms. continuous strip comprising a plurality of identical forms (that is to say, forms of equal length and all having printed head: ings of equal depth) which are capable of being individually detach-ed, in succession,

from the strip after having been filled-in.

The strip may be for this purpose provided with transverse lines of perforations determining the length of the forms.

In machines of the kind referred to, each complete rotary movement of the platen 1n feeding one blank in the forward direction has a constant total amplitude but is capable of being performed in two stages whose relative extents are variable. The first stage, whose amplitude is dependent upon the number of lines written upon the individual form, is performed step-by-step under the control of line-spacing mechanism as usual. The second or complementary stage, whose amplitude corresponds to the space left between the last line written upon the completed invoice and the place at which the writing on the succeeding invoice is to commence, may be effected by a single continuous movement after he invoice has been typed. For this purpose the platen is preferably adapted to be rotated, during the second stage of its movement, by means of a pawl which engages a ratchet-wheel fast on the platen-spindle, thispawl, at the conclusion of the second stage, being arrested by a stop. At this time the form which has-just been written on can be detached. Before the fresh invoice-form (now in position for being written upon) is moved by the line spare mechanism, the pawl mustbe brought to its normal position. For this purpose it is mored.backward until arrested; y another stop whose rearward distance from the first slop has been adjusted to correspond with the total length of an invoice-form.

One object of the present invention is to These are preferably in a renderautomatic this return of the platcndriving pawl to what may be called normal position at the conclusion of each cycle of operations; c. that position which it should occupy at the commencement of writing on each fresh invoice-form. To this end the pawl, on attaining the limit of its forward movement, is preferably automatically released from engagement with the ratchetwhccl through the medium of which it actuatcs the platen; a tensioirdevice connected on the one hand with the pawl and on the other hand with a portion of the machine is preferably adapted, during forward rotation of the pawl, to store energy whereby the pawl, when released from the ratchetwheel, will be returned to normal position; and the pawl, on attaining the limit of its backwart movement, preferably automatipivoted to aradius-arm rotatable about the axis of the ratchet-wheel through the medium of which wheel the pawl drives the platen forward. The alternate disengage ment and rctingagcment of the pawl from and with its ratchet-wheel at the conclusion of the forward and backward movements of the; laten respectively, preferably effected 'y utilizi: g the terminal movement of the radius-arm in. each direction to produce displacement of the pawl aboutits pivot. For this purpose the stopswhich serve to limit the forward and backward movements respectively may lie in the path of a tappet on the pawl. The movement of tliepaax'l about its pivot is'limited so as to cause the rotation of the pawl-carrying arm to be arrested innnediatcly after the arrest of tho tappet. \Vith an arrangement of this kind, it is evident that, if the tappet were unable to pass a stop, the total forward Ni /61110311 of the platen at each cycle of operations could not exceed one revolution of the platen. cordi 'l in order to permit of the movement of the platen beadjusted at will between a mimimum considerably less than one revolution and Gad always operative, when mounted in position; and an indirect stop (as the other kind may be called)"which operative only when used in conjunction with an inis terponent or devlce capable of being interposed between the stop andthe pawl. The interponent just referred to comprises what may be termed an auxiliary sto and preferably one such coiiperates wit two indirect stops in turn, according to the direction of motion of the pawl. For this purpose the auxiliary stop, which lies in the path of the tappet, may be mounted upon an arm freely rotatable about the axis 16 ofthe platen. The auxiliary stop-arm or 'interponent is adapted to be carried around by contact,- with the tappet,'and its path is intercepted by the indirect stop or stops when one or both of these is or are mounted 20 in position. The eiiect of the arrangement is that an indirect stop will permit the passage of the pawl carrying arm until, in the revolution of the latter, the auxiliary stop-arm has been arrested by said indirect stop; whereupon the auxiliary stop will act upon the tappet in the same way as a direct stop.

A detent-may be provided for preventing accidental disturbance of the platen-driving pawl when respectively engaged with and such an arrangement, the power required to effect the automatic return of pawl to normal position may be stored in spring coiled (for example) about the platen-axis and having its ends attached to the sleeve and to the platenrarriage respectively.

In order to facilitate and expedite the operation of advancing the platen through the second stage of its movement, the platen drivingpawl may be rotated in its feeding motion by a lever provided with a crank handle and mounted to oscillate about a fullcrum on the platen-carriage. This lever replaces the hand-wheel above described and may be geared to the pawl in such manner as to enable (say) rather less than one half revolution of the handle to serve for advancing the pawl throughout its maximum permissible travel. The release of the pawl from the ratchet-wheel at the conclusion of the forward movement of the platen may result in the crank-handle as well as the pawl being returned automatically to normal position by a spring in a manner similar to that above noted in connection with the hand wheel.

The modified construction just described enables the second stage of the forward r0- tation of the platen to be effected by s0 simple and direct a movement of the crankhandle that the force applied thereto in rapid working is apt to be sufficiently Vio- Dent to impart to the platen a momentum wh'ch would cause the platen to overthrow its 'oper position to the extent of a tooth on th line space ratchet-wheel.

in order to prevent such overthrow move ment of the platen, the arrest of the crankhandle may be utilized for the purpose of bringing into the path of the platen a stopdevice whereby the forward rotation of the platen will be positively arrested. For this purpose the stop which serves to limit the forward movement of the platen-driving pawl may be permitted to yield slightly when encountered by the pawl or some part moving as one therewith, the yielding movement of the stop being utilized to bring into operative position a detent adapted to intercept a teeth of a ratchet-wheel which is fixed to or otherwise mounted to turn as one with the platen. The pawl has a positive driving engagement with the ratchet wheel for either direction of rotation, so that the platen may be rm'ated haclrwaratl for making corrections, interlinin etc, without alfecting the ultimate posit.

ion of the worksheet when the driver has completed its forward wherein the forward rotation of the radiusarm which carries the platen-driving pawl is eliectcd by means of a hand-wheel, while Figs. 5 to 7 inclusive illustrate an arrangement wherein the same movement is effected means of a cranlcha. dlc. Fig. l is an end view, in section on line 1 1 of Fig. 2, showing the platen-driving pawl as having arrested in the position to which it is returned by the tension-device 2 is a plan view, partly in section on line 2-2 of 1. Fig. 3 is a section on line 3 -3 of g: 2, showing the tension-device. 4 is a general plan view showing the parts in the position illustrated in Fig. 1. Fig. 5 is an end view showing the p aten-driving pawl in a position similar to that indicated in Fig. 1; the h'and-wheel beingomitted and a crank-handle being provided for moving the pawl in the forward direction, direct stops also being substituted for the indirect stops and interponent shown in F l. Fim 6 is a plan view of the Fig. .5 arrangement, but with an interponent sul; tituted for Tune of the directstops, and Fig. is an end View ice in section 'on line 77 of Fig. 6. Figs. 8 to 12 inclusive are diagrammatic end views illustrating the functions of the direct and indirect stops and of the auxih iary stop. Fig. 13 is a detail view (drawn to a larger scale) in section on line fl3-l3 of Fig. 2, but showing, a different relative position of the pawl and auxiliary stop. said Fig. 13 showing a jumper-device for retain ing the platen-driving pawl in and out of engagement with its ratchetavhcel alternatively.

Similar reference symbols denote correeponding parts throughout the drawings.

Referring first to the construction illus trated in Figs. 1 to & inclusive, it will he observed that the apparatus to which the present invention specially relates mounted at the right-hand end of the platen-earriage as heretofore. A is the platen fast on the platen-spindle (I; andB isa ratchet-wheel fast on said spindle and having as many teeth as there are line-spaces in one revolution of the platen. C is the pawl whereby I theratchet-wheel B is driven; this pawl C being pivoted at c to a radius-arm l which turns about the platen-spindle as a unit with a sleeve formed in two lengths or.scc-. tions E, E WllOlQOf the inner length F1 carries the arm D while the outer length E carries a hand-wheel F whereby said sleeve may be rotated. F 1 (Fig. 4-) is a hand-wheel fast on the left-hand end of the spindle a as usual. The outer length E of the sleeve also carries a disk G to which is attached one end y of a spring H coiled about the sleeve, the other end it of the spring being made fast to a barrel J which is mounted concentrically with the sleeve and held against rotation by being coupled as at y to the carriage K of the machine. The outer length R of the sleeve is angularly adjustable with reference to the spring-barrel J and to the inner length E (which carries the arm D) forthe purpose of enabling the tension of the spring H to be adjusted, the adjustment being maintained by a set-screw c, which binds the two lengths E, E of the sleeve firmly together.

A circular disk L is mounted concentrically with the platen-spindle aand (in the arrangement illustrated in Figs. 1 to 4.) prevented from r otating by being coupled as at it: to the carriage K. The disk L is adapted to have-removably secured thereto stops forlimiting the movementof the pawl C and controlling its relation to the ratchet wheel. These stops may be either direct stops, such as M and N, shown in Fig. 5, or indirect stops, as M and N, as shown in Fig. 1. It is to be understood that the form of stops used is optional, and that either the direct or indirect stops may be used on the disk L, either form of sto' being adapted for use with the form o :driv ng mechanism shown in Figs. 1 to 4, as well as that shown in Figs. 5 and 6.

When indirect stops H and N, as shown in Figs. 1 to l, are used, an interponent or arm 0, carrying' an auxilliary stop 0, is interposed between the disk L and the pawl C. This interpouent is pivoted to swing freely on the axle a. The indirect stops, which, as shown, are in the form of flat headed screws each adapted to be threaded into any one of an annular series of threaded openings Zin the disk L, are in the path of the interponent, but do not project into posi tion to directly engage the pawl. The stop 0 is in the path of a tappct P on the pawl (J. The interponent is adapted to oscillate between the forward and rearward stops'hI and N respectively, the amplitude of oscillation being controlled by the adjustment of said stops. As shown in Fig. l, the interponent is in engagement with the rearward stop N" and the tappet P has engaged the stop 0 and thrown the pawl into engagement with the ratchet wheel B. The parts are now in position for the forward rotation of the platen. The work form may be fed forward by the line-space mechanism, the hand-wheel F turning with the platen. When the writing on the form is completed, the hand-wheel F may he turned to complete the feeding of the form. When nearly a complete rotation of the platen has been made, the tappet l engages the opposite side of the stop 0, and then carries the interponent forward with the platen during a fur ther rotation, until the interponcnt engages the forward stop M", therebyiarresting the movement of the interponent. The rotation of the platen, and with it the radius arm D, is continued. through a small angle sufiicient to swing the tappet P and with it the pawl C to release the latter from the ratchet wheel B; this movement of the pawl being positively limited by the tail 7) of the pawl engaging the ratchet wheel. When the hand-wheel F is released at the completion of this forward movement, the spring H. automatically rotates the hand-wheel, radius arm and pawl backward, the pawl being held entirely free from the ratchet wheel during such backward movement; and as in the form in a recess in the arm l3, and is yieldingly held against the disk Q, by means of a spring 1", so that the detent is yieldingly held in whichever notch g or g is brought opposite the de- 5 tent for the time being.

Fig. 11 illustrates the range of movement of the platen when auxiliary stops l and N are employed. As here shown, the in terponent is placed so as to inter-pose itself automatically between the tappet P and Whichever stop happens at the moment to be coming into operation. With such an arrangement, the total forward angular movement, which the platen is permitted to 15 make during each sycle of operations, will.

exceed one revolution, but will be less than two complete revolutions. The amplitude of its movement in excess of one complete revolution corresponds to the distance 3/ at which the forward stop M is adjusted in advance of the backward stop N", H1611 this distance is increased to the maximum, or in other words, when the two stops M N coincide in position, or rather when one stop is removed, such arrangement being shown in Fig. 12, the permissible forward movement 2 of the platen will be equal,'or approximately equal, to two revolutions. The direct stops M and N (see Fig. may be in the form of brackets comprising screws to engage the threaded openings Z and thus secure the stops to the disk L. These stops project directly into the path of the tappet P. When the two direct stops M and N are used alone, as diagrammatically illustrated in Fig. 8, the total. forward movement which the platen will be permitted to make at each cycle of operations will not exceed one revolution, theactual amplitude of the movement corresponding to the angular distance a: separating the stops. This distance may be incrcased'to any desired number of line-spaces up to the maximum. distance of a complete revolution, which is eliected when the forward and backward stops M, N, coincide, or in other words, when one of the stops is removed. Such an arrangement is illustrated in Fig. 9.

\Vhen the two direct stops, or a single di.

rect stop, are employed, as indicated in Figs. 8 and 9, the interponent Q is unnecessary, and may be omitted if desired, or, if preferred, the interponent may be retained so as to more readily permit adjustment for a wider range of movement, which can be effected simply by substituting the indirect stops M and N for the direct stops M and N.

Fig. 6 indicates the use of the interponent 0 in combination with a single direct and single indirect stop, as diagrammatically shown in FigqlO. The efi'ect obtainable from this arrangement is practically identical with that described in connection with two direct stops, shown in F lg. "8; that is,

the indirect stop M and interponent with its stop 0 takes the place of the direct stop M. The various arrangements of direct and indirect stops illustrated in Figs. 8 to 12 inclusive, are obviously adapted for use either with the actuating mechanism shown in Figs. 1 to 4, in which the rotation of the platen is effected with the hand-wheel F, or' that shown in Figs. 5 to 7, in which the operating lever T and step-up gearing are employed.

Referring now to the construction illustrated in Figs. 5 to 7, it is to be understood that the sleeve E carrying theradius-arm D (to which the platen-driving pawl C is pivoted at c as before), is aunit, and has fast upon it a spur-pinion s which gears with a toothed segment S mounted to oscillate about a stud t projecting from the end of the platen-carriage K parallel with the platen-spindle a. A' lever T provided with a crank-handle T is attached to the toothed segment so as to turn it by means of a sleeve 29. I

A spring H which fulfils a function corresponding to that of the spring H previously described, is coiled about the stud 2., one of its ends being fixed to the platencarriage K while the other is attached to the lever T; this spring H serving to return the lever T, and therefore also the sleeve E, radius-arm D, and platen-driving pawl C, to the normal angular position which is determined by the adjustable stop N.

When the lever T has been moved in the direction of the arrow (Fig. 5) to the forward limit determined by the corresponding stop M, so as to cause the pawl C, as before, to become disengaged from the ratchet-wheel B, and the crank-handle T is then released, the spring H will causethe return of the lever T, sleeve E, arm D, and pawl C to normal position, and the tappet P will strike the stop N and bring about the reengagel'nent of the pawl C with the ratchet-wheel l3.

A detenp U positively arrests the platen against overthrow at the end or" its feeding movement. Said detent is carried by one arm of a bell-cranlr lever U fulcrum ed upon the same axis 6 that of the lever T, the other arm a of the level L, against which a spring a is fitted to bear, being coupled to the ma: 1 of the disk L by means of a link 1*. PL slight angular movement is permitted to the disk. L and may be determined by limiting the movement of the lever U in any convenient way. This angular movement or" disk L is suilicient when the tappet P strikes a stop to swing arm to downward, thus turning detent U to strike a tooth on ratchet wheel V and so hold the platen.

F is a hand-wheel fast on the platen 5 indie a, and serving the same function as hand-Wheel r (Fig. 4- as in any i l-dinary typewriting machine of the general type illustrated.

Fast on the end of the platen axle near the hand wheel F is a ratchet wheel 2, which forms part of the line-space mechanism. This ratchet wheel is arranged to be driven in line-spacing direction by means of a pawl 3 operated by a hand lever 4 against the tension of a spring 5. This is alined by means of a spring detent 6 entering between the teeth of the ratchet wheel.

In support of the terms found in the claims, it will be noted that the arm D is a manually rotatable member or device normally connected to the revoluble platen A through the pawl or dog C which engages the toothed wheel B and forms a connection between the arm D and the platen to rotate the platen; that the revoluble member I) on which the pawl is pivoted has a pinion 8 thereon with which the speed-multiplying gear S meshes, the gear S having connected thereto a handle T. The stop M forms an arresting device to limit the forward move ment of the arm D and is also a releaser for releasing the pawl from the toothed wheel B concomitantly with the arrest of the arm D. The interponent O provides means to enable the arm D to pass releaser M once and to be both arrested thereby and released from the platen with the succeeding revolution of the platen in the same direction.

Claims:

1. In a typewriting machine, the combination with a rotatable platen and a line space mechanism therefor, of a ratchet wheel fast to said platen, a rotatable arm carrying a pawl for turning said platen by said ratchet wheel, a spring tending to return said arm to normal posit-ion, means for moving said pawl out of engagement with said ratchet at one limit of the throw of said arm, means for moving said pawl into engagement with said wheel at the other limit of said throw, and means for detaining said pawl. in either of said positions while said arm rotates.

2. In a typewriting machine, the combination with a rotatable platen and a line space mechanism therefor, of additional means for revolving said platen, a stop for disconnecting said additional means, and means for positively arresting said platen by movement of said stop.

3. In a t-ypewriting machine, the combina tion with a rotatable platen and a line space mechanism therefor, of a lever arranged "o rotate said platen through a large angle by a small movement of the lever, a pawl driven by said lever, a ratchet wheel fast to said platen arranged to be engaged by said pawl to drive said platen, a stop arranged to arrest said pawl and lock it into engagement with said ratchet wheel, a stop arranged to arrest said pawl and move it from engagement with said ratchet wheel, and a detent to lock said pawl in each position.

t. In a typewriting machine, the combine. tion with a rotatable platen and a line-space mechanism therefor, of a ratchet wheel having a fixed connection with the platen, an arm rotatable about the platen axis independently of the platen, a pawl carried by said arm and engaging the ratchet wheel to drive the ratchet wheel in either direction, means to hold the pawl in engagement with the ratchet wheel, means to limit the rotation of said arm in both directions, and means to automatically disengage the pawl at the completion of the forward movement of said arm.

5. In a typewriting machine, the combination with a rotatable platen and a line-space mechanism therefor, of a ratchet wheel having a fixed connection with the laten, a rotatable arm, a pawl carried there y to engage the ratchet wheel, a stop to release the pawl from the ratchet wheel and positively limit the forward movement of said arm and permit the return movement of the arm independently of the ratchet wheel, and a stop to limit the return movement of the arm.

6. In a typewriting machine, the combination with a rotatable platen and a line-space mechanism therefor, of a ratchet wheel having a fixed connection with the )laten, an arm rotatable independently of t e platen, a pawl carried thereby, means to limit the movement of said arm in both directions, and a device operable during the backward movement of said arm to lock the pawl to the ratchet wheel for driving the ratchet wheel in a forward direction.

7. In a typewriting machine, the combination with a rotatable platen and a line-s ace mechanism therefor, of a ratchet wheel xed to the platen axle, a member loose on the platen axle, a pawl carried by said member, means to rotate said member, and a device operated by power supplied through the backward rotation of said member to lock the pawl to the ratchet wheel, the pawl being released by power supplied through saidmember when operated in a forward direction to permit the return of said member independently of the platen.

8. In a typewritingmachine, the combination with a rotatable platen and a line-space mechanism therefor, of a ratchet wheel having a fixed connection with the platen, a rotatable arm, a pawl carried thereby to cooperate with the ratchet wheel, means to limit the movement of said arm in both directions, and means carried by said arm to lock the pawl to the ratchet wheel during the forvurd movement and to hold the pawl released during the return movement of the arm.

9. In a typewriting machine,the combination'with a rotatable platen and a line-space space mechanism therefor, of a. ratchet.

wheel connected to the platen, an arm rotatable about the platen axi a pawl carried thereby to drive said ratcl wheel, a tappet carried by the pawl, a forward stop in position to .sa' 1 tag Lot and lift the pawl from the ratch. whe l and form a positive stop for arm at the limit of its forward movement, and a rearward stop in the path. of said tappet to limit the return movement of said arm and throw the pawl, into engagement with the ratchet Wheel.

11. In a typewriting machine, the combination with a rotatable platen and a linespace mechanism' therefor, of a, ratchet wheel connected to the platen, an arm loose on the platen axle, a pawl carried thereby to drive the ratchet wheel and platen, e rearward sto in position to positively limit the rearwar movement of said. arm and jam the pawl against the ratchet wheel, and a forward stop to positively limit the forward movement of said arm and lift the pawl from the ratchet wheel, said pawl being held out of contact with the ratchet Wheel during its return movement.

12. In a typewriting machine, the combination with a rotatable laten and a line space mechanism there or, of a ratchet wheel secured to the laten, a rotatable arm, a. pawl carried there y to drive the platen, a disk, and rearward and forward stops carried-by the disk and independently adjustable to different angular positions around the platen axle, said stops operating to move the pawl into 1 d out of drivin connection.

with the ratchet wheel at the imits of its rearward and forward movements respectively. I I

13. In a typewriting machine, the combiratchet wheel, a disk provided with an an I 'nular series of screw-threaded openings spaced to correspond to line space d1space mechanism, stops adapted at any of said openings, and the pawl and controlled e the pawl into and out the ratchet wheel.

7, machine, the combia. co-tar le platen, of a ratchet to the platen axle, an armroon said axle, a pawl carried thereby the ratchet wheel, a stop for. Said arm, A stop -carrying member yieldingly hold stationar lock operated by, the yicldin movement of" said member to lock the platen and thereby prevent overthrow, and. a multiplying device to operate-said arm. 7

15. In a typewriting machine, the combination. with a rotatable platen and a linespacing mechanism therefor, of a ratchet wheel secured to the platen axle, an arm loose on said axle, a pawl carried by the arm to drive said ratchet wheel, a speed multiplying device to drive said arm, a stop to limit the movement of said arm, a. second ratchet wheel having a fixed connection with the platen, a second pawl to engage said ratchet wheel, and a connection between said second pawl and the stop to operate said second pawl.

16. In a typcwriting machine, the combination with a rotatable platen and a line: space mechanism therefor, of a ratchet wheel fixed to the platen axle, an arm loose on the; platen axle and carrying pawl to drive said wheel, a disk loose on theplaten axle, stops to engage the pawland control the movement oi said arm, said stops carried by the diskymean's to drive said arm, a second ratchet wheel fixed to the platen axle, a. dog normally held out of engagement with said seiond ratchet wheel, a link cdnnecting'seid dog to said dish, and means to adjust the efiective length of the link.

17. In a typewriting machine, the'combination with a rotary platen, of a ratchet wheel connected tothe platen, an arm. loose on the platen axle, apawl carried thereby, a spring dctent operable to hold the pawl either in engagement with or out of engagement with the ra tchct wheel, and meansto.

space mechanism therefor, of means for, turning forward said platen a number of 1 9 line spaces, a lock to hold said turning means connected to the platen during said forward.

movement of the platen, means for automat'ically releasing said look as said turning means reaches the limit of its forgyard throw,

means for holding said look so released during the return stroke of said turning means, and means for automatically actuating said lock to connect the turning means to the tances'throu h which the platen is rotated lie-ten at the end of the return. stroke so that the said turning 'means is turned forward as the platen is turned forward by th line-space mechanism.

19. In a typewriting machine, the combination with a rotatable platen and a line space mechanism therefor, of means for turning said platen forward a number of line spaces at one stroke, means for locking said turning means to the platen and keeping it locked to the platen during the forward movement of the platen, so that if said platen is first turned forward by the line space mechanism and then by said turning means,-the sum total of said turning is constant, and means for automatically releasing said lock at the end of a forward turning of the platen by said turnin means.

20. In a typewriting mac line, the comhination with a rotatable platen and a line space mechanism therefor, of other means for turning said platen through a plurality of line spaces, means normally locking said other turning means to the platen, means releasing said other turning means from the platen at the end of its stroke, and means for positively arresting the rotation of said platen when thus released.

21. In a typewriting machine, the combination with a rotatable platen, of a member carrying forward and rearward stops, a

ratchet wheel fast to said platen for turning it, a pawl for driving said ratchet wheel. a tappet on said pawl for positively throwing it in mesh with said wheel by contact with the rearward stop, and for throwing it to idle position by contact with the other stop. and a detent for holding said pawl in each oi' said positions.

22. In a ty 'iewriting machine, the combination with a rotatable platen, of a member cariyinp forward and rearward stops, a ratchet wheel fast to said platen for turning it, an arm carying a pawl for driving said ratchet wheel, a spring normally tending to turn said arm to hold said pawl against rcarward stop, a tappet on said pawl causing it to engage said wheel when it strikes said stop, and who released from said wheel when it strikes the forward stop, and a detent holding said pawl in each of said positions.

23. In a typewriting machine, the combination with a rotatable platen, of a member carrying forward and rearward stops, a ratchet wheel fast to said platen for turning it, an interponcnt arranged to be arrested by said stops, an arm carrying a pawl for driving said ratchet wheel, means for turnins: said arm to turn said platen through said pawl, a tappet on said pawl causing: it to be brought into driving engagement with said wheel when said tappet'carries the interponent against the rearward stop. and to be released from said wheel when it carries the intcrponent against the forward stop,

and a detent holding said pawl in each of said positions.

In a typewriting machine, the combination with a rotatable platen and a linespace mechanism therefor, of a ratchet wheel. fast to said platen, a pawl and pawl-carrying arm for turning" said platen through said ratchet, a rearward stop for limiting the rearward throw of said pawl and arm, means coiiperating with the said stop for setting the pawl locked to said wheel, a for. ward stop for lnmtmg the forward throw into and out of engagement with said,

ratchet wheel, and a detent on said rotatable element for locking" said pawl in each of said positions.

20. lo a typewriting machine, the combination with a rotatable platen and a hand wheel fixed to involve therewith, of an arm loose on the axle of said platen, a spring lending; to return said arm to a given posiiion. a ratchet wheel fast on said axle, a

pawl on said arm arranged to drive said platen through said ratchet wheel, means for moving said pawl into and out of engagement with said ratchet wheel, and a detent for locking said pawl in each of said positions.

27. In a typewriting machine, the combination with a rotatable platen and a hand wheel fixed to revolve therewith, of a rotatable member loose on the axle of said platen. a spring tending to return said rotatable member to a given position, a ratchet wheel fast on said axle, a pawl on saidrotatable member arranged to drive said platen through said ratchet wheel, stops for limiting the rotation of said member in each direction, means coiiperating with the stops for moving said pawl into and out of eneasement with said ratchet wheel, and a tie tent. for locking said pawl in each of said positions.

3H. The combination of a revolublc platen,

a toothed wheel connected thereto, a pawl relrasedtherefrom, said pawl, when in en eas ment with said toothed wheel, serving to turn said nrnually rotatable member as means for holding said pawl either in en,

the platenis line-spaced, andalso enabling the manually rotatable member to drive the platen, means effective at the conclusion of the advance of the platen for releasing said pawl, whereby said manually rotatable ber may be returned to normal position independently ,of said toothed wheel, and means effective at the conclusion of such return stroke for rengaging said pawl to said toothed wheel.

7 .29. The combination of arevoluble platen .a toothed wheel connectedthereto, a pawl or. dog to engage said wheel, a manually rotatable member upon which said pawl is carried, means for holding said pawl. either ;in engagement with said toothed wheeler released therefrom, means efiective at the conclusion of theadvance of the platen for releasing said pawl, a spring for returnin said manually rotatable member to norma 7 position, and means: effective at the conclusion ofsuch return stroke for reeng'aging saidpawl tosaid toothed wheel,

30. The combination of a revolublo platen, a toothed wheel connected thereto, a pawl or dog to engage said wheel, a revoluble member whereon said pawl is pivoted, a upon said rcvoluble member, a speed-multi plying gear meshing with said pinion, a handle connected to said gear, yielding gagement withsaid toothed wheel or re leased therefrom, said pawl, when in engagement with said toothed wheel, serving to turn. said handle as the platen is' linespaced', means ell'ective at the conclusion of the advance of the platen'for releasing said pawl,-a spring for returning said pinion and gear to normal positionin'dependently of said toothed wheel, and means effective at the conclusion of such return stroke for reengaging said pawl to said toothed wheel.

31. The combination of a revoluble platen, a toothed wheel connected thereto, a pawl or dog to engage said toothed wheel. to be driven thereby during the initial part of the revolutign of the platen, and to drive the toothed wheel during, the final portion of the revolution of the platen, amanually oper able device connected to said pawl to be driven thereby and also to drive the same, said pawl being releasable from said wheel to return around said wheel to initial posi" tion independently of the wheel, means for determining theinitial position of the manually operable device and pawl, and means eficctive after said wheel has more than completed. an entire revolution when in engagement with said pawl, for determining the point of conclusion of too advance stroke of the platen, wheel and pawl. Y

32. The combination of a revoluble platen, a toothed wheel connected thereto, pawl or dog to enga c said toothed wheel to be driven thereby uring the initial part of therevolution of the platen, and to .drive the toothed wheel during the final portion of the revolution of the platen, a manually operable device connected to said pawl to be driven thereby and also to drive the same, means eiiectiveafter said Wheel has more than completed an entire revolution when in engagement with said pawl, for determining the point of conclusion of the advance stroke of the platen and disengaging the pawl from the wheel, and means for arrestring the manually operable device upon the 'ffcompletion of its return stroke and concomitantly reengaging the pawl with the wheel. 7 v

33. The combination with a revolubl platen, of a member normally connected to the platen to be carried around thereby, an

has completed more than an entire revolu- 'tlon, and means effective upon the conclunect it from said normally-connected member, to permit return of the latter inde pendently' of the platen;

3c. The combination with a revoluble therefrom, a releaser pastwhich said member may move, and means to enable said member, afterpassing the releaser once, to be thereby both arrested and releasedfrom the platen at the succeeding revolution of the platen in the same direction.

The combination with a revoluble platen, of a member normally connect d to the platen to turn therewith but releasable therefrom, a releaser past which said membermay move, means to enable said member, after passing the releaser once, to be thereby both arrested and released from the platen at the succeeding revolution of the platen in the same direction, a spring con nected to said released member to return it independently of the platen, and means to cooperate with said spring to reconnect said released member to the platen.

36. The combination with a revolu'ble platen, of member normally connected to the platen to turn therewith through more than one revolution at a time but releasable therefrom, a stop out of the path of said normally-connected member, and a loose interponent to engage both said stop and said normally-Connected member to arrest the latter and release it from the platen upon the second revolution of said memberin the same direction at one advance thereof,

37. The combination with a revoluble platen, of a member normally connected to the platen to turn therewith through more than one revolution at a time but releasable therefrom, a stop out of the path of said ponent to engage both said stop and said horplaten, of a member. normally connected to, the platento turn therewith but releasable normally-connected member,,a loose interarresting. device efiective after the platen sion of the advance of the platen to disconmally-connected member toarrest the latter and release it from the platen upon the second revolution of said member in the same direction at one advance thereof, and

means to return said released member independently of the platen and then to re-corr nect said member to the platen.

38. The combination with a revoluble platen, of a member normally connected to 1 ponent to engage both said stop and said nected member, to complete the throw of normally-connected member to arrest the latter-and release it from the, platen upon the second revolution of said member in the same direction at one advance thereof, and a handle connected, to said normally: connected member for completing the advance of the platen when necessary.

39. The combination with a revoluble platen, the platen to turn therewith through more than one revolution at a time but releasable therefrom, a step out of the path of said normally'eonnecte'd member, a loose interponentto engage both said stop and said normally-connected member to arrest the latter and release it from the platen upon the second revolution of said member in the samedirection. at one advance thereof, and a handle connected by means of movementmultiplying gearing to said normally-connected member, to complete the throw of the platen when necessary.

tOfThe combination with a revoluble platen, of the platen to turn therewith through more than one revolution at a time but releasable therefrom, a stop out of the path of said normally-connected member, a loose interponent to engageboth said stop and said normally-connected member to arrest the latter and release it'from the platen upon the second' revolution of said member in the same direction at-one advance thereof, means to return said released member independently of the platen and then to re connect said member to the platen, and a handle connected by means of movementmultiplying gearing to said normally-conthe platen when necessary.

41. The combination of a revoluble platen, a toothed wheel connected thereto, a pawl or dog to engage said toothed wheel to be driven thereby during the initial part of the revolution of the platen, and to drive the toothed wheel during the final portion of the revolution of the platen, a manually operable device connected to said pawl to be driven thereby and also to drive the same,.means effective after said wheel has more than completed an entire revolution when in enof a member normally connected to a member normally connected to gagement with said pawl, for releasing said pawl from the platen, a spring to return said manually operable deviceindependently of the platen, and means to re-connect the pawl with the platen upon the conclusion of such return stroke.

42. The combination with a revoluble platen, of amcmber normally connected to the platen to becurried around thereby, a

handle connected to said normally-connected member to complete the rotation of the platen, settable means for arresting said normally-connected member at will either before or after the platen has completed an entire revolution in one directiom andymeans effective upon the conclusion ,of such advance of the platen to disconnect itf/from said normally-connected member, to permit return of the latter independently of the platen.

43. The combination with a revoluble platen, of a member normally connected to the platen to be carried around thereby, a

handle connected to said normally-connected member to, complete the rotation of .the platen, settable means for arresting said normally-connected member at will either before or after the platen has completed an entire revolution in onedirection, and means efiective upon the conclusion of such advance of the platen to disconnect it from said normally-connected member, to permit the return of the latter independently of the platen; said arresting means including a support upon which stops are adjustable,

and also including a loose interponent to cooperate with the stops.

44. The combination with ,a revoluble platen"a nd,line-feeding mechanism, of a de vice normally connected therewith to be rotated thereby, a handle connected to operate through said normally-connected device to complete the advance stroke of the platen when necessary, and means operable by said handle to check the platen against overthrow.

45. The combination of a revoluble platen, a manually operable device rotatable about the platen axle, a connector between said device and the platen for connecting said device to the platen and causing the platen tobe rotated when the said device is rotated manually, a stop to limit the forward movement of said device, means cooperating with said stop to move said connector to an inoperative position, permitting said device to be returned independently of the-platen, and a stop to limit the return movement of said device and move said connector to opera ative position.

46. The combination with a revoluble .platen, of a manually operable device rotatable about the platen axle, a connector carried by said device and movable into and out of position to drive the platen when said todrive' said device when the platen is rotated bypower applied independently of said'd'evi'ce, stops to limit the forward and return movements of said device, means to automatically release said connector from the platii when said device reaches the limit of-fits forward movement and permit.

saiddevice to returnindependently of the platen, and means to move said connector to operatirre-position when said device oom- 'pl ets its return movement.

47. The combination with'; a revol'nble platen, of a maasaug operabie device rotatable about the platen axle, a connector carrietl' by said device and movable into and out of position to drive the platen when said arias said device when the platenis rotated by power applied independently of said devicig's tops to limit the forward and return ovements oi? said device, means to automaticall'y release said connector from the platen when said device reaches'the limit of its forwar'd' movement'and permit said device to return independently of the platen, means to move said connector to operative positionwhen said device completes its return movement, a pinion connected to rotate with" said device, a; speed-multiplying gear to drive said saikil gear. a

48. The combination with a revoluble platen; ora manually operable member rotatabie who is the platen axle, connecting means between said member and the platen for rotating the platen when said member pini'on, and a handle to rotate Manatee is rotated, forward and rearward stops to 7 into eflective position by the rotation of said stop carrier. A

, 49. The combination with a revoluble platen, of a manually operable member rotatable about the platen axle, cormecting means between said member and the platen for rotating the platen when said member is rotated, forward and rearward stops to devite' is rotated," said connector operable tolimit the movement of said member, a carrier for said stops loose on theplaten axle, means for yieldingly holding said sto carricr stationary during the rotation 0 said manually operable member, and permitting a limited rotation of the stop carrier when said member is arrested by a stop, a lock to prevent overthrow'of the platen moved into eflective position by the rotation of said stop carrier; said lock comprising a toothed wheel fixed to the platen, a pivoted locking dog, and. a link connecting said do to the stop carrier for?" throwing the dog'into en- 1 gagement with said toothed wheel when the stop carrier is rotated by the said manually operable member.

JOHN JOSEPH COGPER. Witnesses:

L. G. MORGAN, R. W ItsTAoo'rT. 

